xochimilco trajineras
originally of valley laid beneath waters of lake texcoco, system of interconnected salt , freshwater lakes. aztecs built dikes separate fresh water used raise crops in chinampas , prevent recurrent floods. these dikes destroyed during siege of tenochtitlan, , during colonial times spanish regularly drained lake prevent floods. small section of original lake remains, located outside federal district, in municipality of atenco, state of mexico.
architects teodoro gonzález de león , alberto kalach along group of mexican urbanists, engineers , biologists have developed project plan recovering city of lakes. if approved government project contribute supply of water natural sources valley of mexico, creation of new natural spaces, great improvement in air quality, , greater population establishment planning.
pollution
air pollution on mexico city
by 1990s mexico city had become infamous 1 of world s polluted cities; however, city has become model dramatically lowering pollution levels. 2014 carbon monoxide pollution had dropped dramatically, while levels of sulfur dioxide , nitrogen dioxide 3 times lower in 1992. levels of signature pollutants in mexico city similar of los angeles. despite cleanup, metropolitan area still ozone-polluted part of country, ozone levels 2.5 times beyond who-defined safe limits.
to clean pollution, federal , local governments implemented numerous plans including constant monitoring , reporting of environmental conditions, such ozone , nitrogen oxides. when levels of these 2 pollutants reached critical levels, contingency actions implemented included closing factories, changing school hours, , extending day without car program 2 days of week. government instituted industrial technology improvements, strict biannual vehicle emission inspection , reformulation of gasoline , diesel fuels. introduction of metrobús bus rapid transit , ecobici bike-sharing among efforts encourage alternate, greener forms of transportation.
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